21496975

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{149}}^1\times {\mathrm{199}}^1$

素因数の和:387

約数の個数: 24

約数和(自身を含む): 27900000

約数和(自身を除く): 6403025

約数列:

[1, 5, 25, 29, 145, 149, 199, 725, 745, 995, 3725, 4321, 4975, 5771, 21605, 28855, 29651, 108025, 144275, 148255, 741275, 859879, 4299395, 21496975]

約数ペア:

[(1, 21496975), (5, 4299395), (25, 859879), (29, 741275), (145, 148255), (149, 144275), (199, 108025), (725, 29651), (745, 28855), (995, 21605), (3725, 5771), (4321, 4975)]